VOL-1558 Update vendored voltha-go and other items

Result of running dep ensure.  golang openolt now
builds.

Also update dockerfile to used specific alpine version

Change-Id: I1e5407e25bb0636a241a0650d1e44e5df567f44b
diff --git a/vendor/github.com/cevaris/ordered_map/Makefile b/vendor/github.com/cevaris/ordered_map/Makefile
new file mode 100644
index 0000000..099e53b
--- /dev/null
+++ b/vendor/github.com/cevaris/ordered_map/Makefile
@@ -0,0 +1,10 @@
+all: build install 
+
+build:
+	go build
+
+install:
+	go install
+
+test:
+	go test -v *.go